Nothing scares an intruder like a vicious dog. This multi-function BARKING DOG ALARM utilizes radar-wave sensor technology to detect intruders through walls made of cement, glass, brick, wood, etc. When this device senses an intruder within it's "triangle" of protection, it begins emitting the angry barking of a dog. The unit can also be used in chime mode to simply alert you of visitors. The radar is adjustable from 10 to 20 feet and the volume can also be adjusted to suit the situation. The unit is powered by an AC adapter, but also utilizes 8 AA batteris as a backup. A remote control is included to allow you to Arm and Disarm the unit as well as activate the built in panic alarm. An additional sensor (HA-MOTION or HA-SENSOR) can be connected for additional range.